# Atomic Mass Of O

## Atomic and Molecular Weights

The subscripts in chemical formulas, and the coefficients in chemical equations represent exact quantities. (ce{H_2O}), for example, indicates that a water molecule comprises exactly two atoms of hydrogen and one atom of oxygen. The following equation:

[ ce{C3H8(g) + 5O2(g) rightarrow 3CO2(g) + 4H2O(l)} label{Eq1}]

### Atomic Mass Of Oc

not only tells us that propane reacts with oxygen to produce carbon dioxide and water, but that 1 molecule of propane reacts with 5 molecules of oxygen to produce 3 molecules of carbon dioxide and 4 molecules of water. Since counting individual atoms or molecules is a little difficult, quantitative aspects of chemistry rely on knowing the masses of the compounds involved.

To calculate the atomic mass of oxygen using the data in the above table, we must first multiply the mass of each isotope by its corresponding natural abundance (percentage abundance). But, since the abundance is in%, you must also divide each abundance value by 100. . Skill 3-1 Calculate the molecular mass of a compound as the sum of the atomic masses of its elements. Molecular mass H 2 O = (2 x atomic mass of H) + atomic mass of O = 2(1.008 amu) + 16.00 amu = 18.02 amu. So, one mole of water (6.022 x 10 23 molecules) has a mass of 18.02 g. Molar mass of NaCl = atomic mass of Na (22.99 amu) +.

Atoms of different elements have different masses. Early work on the separation of water into its constituent elements (hydrogen and oxygen) indicated that 100 grams of water contained 11.1 grams of hydrogen and 88.9 grams of oxygen:

[text{100 grams Water} rightarrow text{11.1 grams Hydrogen} + text{88.9 grams Oxygen} label{Eq2}] Later, scientists discovered that water was composed of two atoms of hydrogen for each atom of oxygen. Therefore, in the above analysis, in the 11.1 grams of hydrogen there were twice as many atoms as in the 88.9 grams of oxygen. Therefore, an oxygen atom must weigh about 16 times as much as a hydrogen atom:

[ dfrac{dfrac{88.9;g;Oxygen}{1; atom}}{dfrac{111;g;Hydrogen}{2;atoms}} = 16 label{Eq3}]

Hydrogen, the lightest element, was assigned a relative mass of '1', and the other elements were assigned 'atomic masses' relative to this value for hydrogen. Thus, oxygen was assigned an atomic mass of 16. We now know that a hydrogen atom has a mass of 1.6735 x 10-24 grams, and that the oxygen atom has a mass of 2.6561 X 10-23 grams. As we saw earlier, it is convenient to use a reference unit when dealing with such small numbers: the atomic mass unit. The atomic mass unit (amu) was not standardized against hydrogen, but rather, against the 12C isotope of carbon (amu = 12).

### Oxygen Atom

Thus, the mass of the hydrogen atom (1H) is 1.0080 amu, and the mass of an oxygen atom (16O) is 15.995 amu. Once the masses of atoms were determined, the amu could be assigned an actual value:

1 amu = 1.66054 x 10-24grams conversely: 1 gram = 6.02214 x 1023amu

### Atomic Mass Of O2

Thus, oxygen was assigned an atomic mass of 16. I hope u like It .. Make sure To hit thanks We now know that a hydrogen atom has a mass of 1.6735 x 10-24 grams, and that the oxygen atom has a mass of 2.6561 X 10-23 grams. 16 g ÷ 1000 = 0.016 kg. FREE Expert Solution Show answer. The average mass of an oxygen atom is 5.3 {eq}times {/eq} 10{eq}^{-26} {/eq} kg. Molecular nitrogen (N2) would be twice as much. 16g = ? The chemical symbol for Oxygen is O.. Atomic Mass of Oxygen. we Know that , 1000g = 1 kg . Calculate the kinetic energy of a mole of oxygen atoms, all moving at a speed of 400 m/s. Atomic mass of Oxygen is 15.9994 u. Problem: Calculate the mass (in kg) of 4.87 x 10 25 atoms of Zn.A) 1.09 kg B) 1.89 kg C) 5.29 kg D) 1.24 kg E) 8.09 kg. An oxygen molecule consists of two oxygen atoms whose total mass is 5.3 x 10^-26 kg and whose moment of inertia about an axis perpendicular to the line joining the two atoms, midway between them, is 1.9 x 10^-46 kg*m^2. Its Molar Mass will Be 16 Because if We Find Molar Mass Just See A.M.U. Atomic Mass of Oxygen. Atomic mass of Oxygen is 15.9994 u. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. The atomic mass is the mass of an atom. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. 97% (160 ratings) Problem Details. Of any Elements Atom .. And Apply just G{gram} .. this will became Its Molar mass . Calculate the kinetic energy of a mole of oxygen atoms, all moving at a speed of 400 m/s… As we saw earlier, it is convenient to use a reference unit when dealing with such small numbers: the atomic mass unit. Solution for The average mass of an oxygen atom is 5.3*10^ -26 kg . The mass of nitrogen is 2.325x10^-26 kg. That is for a single atom. Atomic Number of Oxygen.

### Atomic Mass Unit

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